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The USA Standard Spool for Ford 9" with 31-spline axles provides full-time lockup by replacing the carrier assembly. Built for strength and simplicity, the spool installs directly into the axle housing to deliver 100% traction to both wheels. Intended for off-road or racing use rather than daily street driving, it is a cost-effective traction solution for Ford 9" applications with 31-spline axles.
USA Standard Spool For Ford 9in / 31 Spline
